Metallic end closure for paper cartons



Nov. 2, 1937. J. M. FREDERICK 2,097,917

METALLIC END CLOSURE FOR PAPER CARTONS Filed Aug. 14, 1936 2 Sheets-Sheet l Nov. 2, 1937. J. M. FREDERICK 2 097,917

METALLIC END CLOSURE FO R PAPER CARTQNS Filed Aug. 14, 1936 2 Sheets-Sheet 2 JET- ' attached to the paper carton Patented Nov. 2, 1937 METALLIC END CLOSURE FOR PAPER CARTONS Joseph M. Frederick, Baltimore, Md., assignor of one-half to Jacob L. Rosenfield, Baltim Application August 14, 1936, Serial No. 96,065 4 Claims. (01229-43) This invention relates to receptacles and closures therefor and more particularly'to metallic end closures for paper cartons.

Paper cartons provided with metallic end closures are extensively used and in all cases the.

metallic end closures formed of sheet metal are or crimping operation. Where the cartons are of o ipgldies; and

cylindrical form, the attachment of the metallic end closures by these methods at this time present no problem. Where the cartons are multi-sided it is necessary that "the edges thereof be rounded and of a substantial radius of curvature in order to permit of the spinning operation. With the use of cartons of this character numerous commercial disadvantages result primarily from the fact that as the cartons aremade up in advance the rounded edges thereon do not permit of the folding of the cartons along said edges there being thus required a vast amount of storage space for the same. As paper cartons provided with sharp corners or edges and open at each end will permit of collapsing the same it will be obvious that the same quantity of cartons may be stored in a storage space of considerably less volume.

7 It is accordingly the principal object of thisinvention to provide a pre-formed end closure formed as a sheet metal ended carton having sharp edges or corners and to secure the same to said carton by a simple clamping operation to produce a tight and leak proof connection.

Another object of this invention relates to the manner of forming the metallic end closure.

A further object of this invention relates to the method of assembling the carton and end closure and the manner. in which the clamping operation is eifected. I

With the objects above indicated, other objects of the invention will become'apparent as the description thereof given hereunder proceeds with reference to the annexed drawings wherein:

Fig. 1 is a perspective view showing the metallic end closures applied to a carton;

Fig. 2 is a transverse sectional view of one of the attached endclosures taken on line 22, Fig. 1;

Fig. 3 is a plan view attached end closures; I

Fig. 4 is a plan view of the sheet metal blank from which the end closure is formed;

Fig. '5 is a plan view and Fig. 6 is a cross-sectional view of the blank af er the first forming operation thereon;

Fig-7 is a plan view of the completed end closure andFig. 8 is a cross-sectional view;

Fig. 9 shows in plan the end closure as applied to thecarton and the relationship of the clampshowing one corner of the by either a spinning stamping to 'an open- Fig. 10 shows the Ill-40, Fig. 9.

In view of the comparative thinness of the sheet metal employed in the end closures and the paper employed in the carton the same have been same in section taken on line ness.

Referring to the drawings, I denotes a carton which may be of paper or other suitable material rectangular shape.

and in the form shown is of the sides ll being of greater width than the sides l2. The carton Ill is made from a fiat sheet transversely scored to define with the ends of the sheet overlapped and joined together to form a box with open ends, in the manner well known, and capable of being collapsed to the extentthat the same will be fiat with the sides engaging each other. This arrangement permits of preforming the cartons (at one place), and storing the same in bundles with the occupancy of a minimum amount of storage space. The end closures l3 are attached to the carton iii in the manner to be hereinafter described.

The end closure I3 is formed ofsheet metal of relatively thin gauge as customarily employed in the manufacture of tin cans, etc., and in. its initial form comprises a flat blank l having the rectangular shape shown in Fig. 4. iii of the blank iii are cut out to provide extensions i1 and I8. which are to be pressed into channel shape as will be hereinafter described. Each extension I! is definedby an outer portion having a length X and inner portion having a length Y, the respective ends l9 and 20 of which are parallel to each other and joined by an intermediate inclined edge 2i Similar ends I9 2| and 20 are provided on the extensions l8, the

construction being such that the ends 20 and Z0 intersect, are innermost and at right-angles to each other; the inclined end portions 2i and 2| are parallel; and the ends 19 and I 9 outermost and at right-angles to each other; the whole forming the cut-out corners i 6 as above indicated. This corner construction will permit the ends oi. the channels to be formed from the extensions I! and i8; to be mitered so as to come into abutting engagement when the-completed end closure I3 is attached to the carton as will be hereinafter described. As is apparenteach cut-out comer portion is symmetrical about a diagonal line bisecting the comer. with the intermediate end portions 2l--2i parallel to said diagonal line. The next step in vthe formation of the end closure I3 is to turn up the edges of the extensions l1 and iii to form flanges 22 which are of relatively small width and of uniform height throughout their extent. Thelast step in thejormation of the end closure is to press the extensions l1 and I! on the corner edges and The corners shown in the various figures of exaggerated thickis adapted to within the enclosure defined dies 3| in the direction indicated by the arrows 'ingly forced into nel walls 28 is the blank l5 spectively the wall 21 of each of the blank, the outside wall 28 comprising the outside portion X being inclined outwardly a5 flange 22 directed towards the inside wall 21 and normally spaced therefrom a distance sufllcient to permit the entry of the walls or sides of the carton i0. Referring to Fig. 8 it will be observed that the channels are ,of uniform depth, the .walls thereof being joined together in a common plane to one side of the body portion of the blank and parallel therewith. The constructional form blank shown in Figs. '1 and 8 comprises the structurally complete end closure II, which may be finished by a varnished, japanned or enameled operation.

The flange 22 serves as a gripping medium and be forced into the walls of the carton III to securely hold the end closure there- End closures II of the character scribed are susceptible of automatic machine attachment to the carton. with the carton held in a vertical machine the end closure is positioned over the open end of the carton and through the medium of a plunger die element 30 is forced downwardly so that the edge portions of the sides II and I2 of the carton completely enter the channels in the manner clearly shown in Fig. 10, and with the inside channel walls 21 in abutting engageisone-half the length of the channel 25. The

dies 3| are so machined that when the end faces of the legs thereof are inside dimensions of the rectangle defined thereton. Thus,

end of the carton and with seated by the channels 25 and 26, the outside walls 28 of the channels are forced into engagement with the cartonsides H and I2 by a simultaneous movement 'of the in Fig. 9, to effect a] pressure clamping of the channel walls on the carton sides; the flanges 22 on the outside channel walls being accordthe surface of said carton sides penetrating the same as clearly shown in Fig. 2.

In view of the thinness of the sheet metal employed in the end closures I3 the outside channel walls 28 will, in the attached position of the same on the carton, lie. substantially flush with the outer surface of the carton sides, and in view of the flanges 22 cutting into and penetrating the walls ll of the carton, the removal of the metallic closure by prying open the chanimpossible without destruction of the carton. The above described -method of clampingthe end closure I! over the open end of the carton produces a rounded edge 24 at the comers of the end closure, of the same curvachannel constituted by the in-. ner portion Y is'formed normal to the plane or the as above deposition in the automatic capping inside surfaces of the carton in abutting relation the ture as the very small fillet 35 at the apex of the legs 32 and 33 of the dies 3|. This rounding 0115 the corners brings the ends of the channels 1{nto abutting engagement and obviates sharp corners which might accidently cause cuts and tears. Fig. 3 shows enlarged, a corner of the attached end closure.

With one end closure attached to the carton the same may be reversed, the commodity placed therein and the other end closed by a similar end closure in the identical manner as above described.

It is to be understood that end closures of this character may be applied in a similar manner to any shape carton having a plurality of sides such as triangular, hexagonal, etc., as well as to cartons of cylindrical form.

Having thus described my invention, claim is:-

l. A metallic closure comprising a sheet metal stamping having a plurality of straight side edges with adjacent side edges thereof arranged at an angle to eachother to define a corner, a cutout portion at each corner symmetrical with respect to a line bisecting said corner, said cutout portion being defined by diverging inner and outer edge sections, and intermediate edge sections connecting the same and arranged parallel what I .to said line. Y 2. The metallic closure as specified in claim 1,

of each cut- -edge sections and are arranged with respect to ure,

3. A receptacle of paper or other fibrous material having a plurality of sides and at least one open end, prising a unitary to provide a fiat bodyportion and a substantially vertical channel at each side thereof each channel being adapted to receive therein the entire edge portion of a corresponding side wall of said receptacle, the transverse edges of adjacent channels being mitered and in juxtaposed relation so that in the fastening of the closure to the receptacle by the forced clamping of the channel walls to said edge portions of the receptacle side walls the mitered and edges of said channels are forced into abutting engagement to definesolid corners completely covering the corners of said receptacle.

4. In the receptacle as specified in claim 3, wherein each channel comprises substantially vertical inner and outer walls projecting above the plane of, said flat body portion, said outer walls being each provided at its lower free edge with an inwardly directed flange adapted to penetrate into the side walls of said receptacle to effect a non-removable attachment of said JOSEPH M. FREDERICK. 

